A screwdriver specialised tooling? Not being an accountant I have no idea if the L1011 was a successful aircraft with regards to making profits for its operators.Possibly it would have been even more profitable if it had been easier to maintain.Accessability to many components was poor and added to the ground time for defect rectification.I have considerable experience of Boeing,Airbus and older British types - the HS Trident series run the L1011 a close second for difficult maintenance. The Trident was another aircraft that was loved by its crews for its handling qualities in spite of being underpowered.
All this is a bit off thread so I will now belt up.